RESUMO
In order to evaluate the influence of 38% silver diamine fluoride (SDF) application on enamel and dentin bond stability of universal adhesives in self-etch mode, a 38% SDF and three universal adhesives were used in this study. Initial shear bond strength (ISBS), fatigue bond strength (FBS), and shear bond strength of survivors (SBSS) to enamel and dentin of universal adhesives in self-etch mode, with and without SDF application, were determined. SDF was applied to the polished enamel or dentin surface for 1 min, water-rinsed and air-dried for comparison with controls. The universal adhesives were applied to the prepared samples and composite resin was bonded using a mold-enclosed method. Enamel bond stability of universal adhesives with SDF (ISBS: 14.7-20.4 MPa; FBS: 5.5-7.4 MPa and SBSS: 14.4-21.5 MPa) was significantly weaker than those without SDF (ISBS: 28.0-29.2 MPa; FBS: 12.1-15.6 MPa and SBSS: 28.4-34.4 MPa). Dentin bond stability with SDF (ISBS: 14.8-20.9 MPa; FBS: 7.1-8.2 MPa and SBSS: 17.3-21.8 MPa) was also significantly weaker than without SDF (ISBS: 19.3-36.1 MPa; FBS: 11.0-13.7 MPa and SBSS: 22.2-34.6 MPa). The results suggest that SDF application on enamel and dentin reduces the bond stability of universal adhesives in self-etch mode.
Assuntos
Colagem Dentária , Adesivos Dentinários , Cimentos Dentários , Esmalte Dentário , Dentina , Fluoretos Tópicos , Teste de Materiais , Compostos de Amônio Quaternário , Cimentos de Resina , Resistência ao Cisalhamento , Compostos de PrataRESUMO
Esthetic problems in maxillary central incisors are often difficult to treat with dental implants. It is necessary to preserve the interdental papillae, or regenerate them if they are absent, and minimize the risk of loss of hard or soft tissue. This task may be made easier by the recent introduction of ultratranslucent zirconia, which can be used with custom zirconia abutments to mutually enhance the effectiveness of both materials. This case report describes implant therapy with ultratranslucent monolithic zirconia restorations in the esthetic zone. In this approach, adequate pink esthetics can be achieved by delayed titanium implant placement in conjunction with guided bone regeneration. Ultratranslucent monolithic zirconia restorations with custom zirconia abutments provide predictable esthetic results.
Assuntos
Implantes Dentários para Um Único Dente , Implantes Dentários , Estética Dentária , Zircônio , Coroas , Dente Suporte , HumanosRESUMO
The purpose of this study was to evaluate whether surface wetness would influence the bonding effectiveness of universal adhesives in etch-and-rinse mode. All-Bond Universal (AB), G-Premio Bond (GP), Prime & Bond Active (PB), and Scotchbond Universal Adhesive (SU) were evaluated. Initial bond strengths and bond-fatigue strengths of universal adhesives to both wet and dry enamel and dentin in etch-and-rinse mode were determined. Scanning electron microscopy observations of the adhesive interfaces were also conducted. The bond-fatigue durability of universal adhesive to enamel in etch-and-rinse mode was influenced by the surface wetness, unlike that to dentin. The bond fatigue durability of AB and GP to dentin in etch-and-rinse mode was different depending on the surface wetness, unlike that of PB and SU. The thicknesses of the adhesive or hybrid layer of resin-dentin interfaces were not influenced by the surface wetness, but the length of resin tags in the wet group was longer than in the dry group. Some universal adhesives with the addition of specific components and optimization of water content can achieve stable bonds regardless of surface wetness, but the surface wetness of dentin is still a significant factor for universal adhesive bonding in etch-and rinse mode, unlike that of enamel.
Assuntos
Condicionamento Ácido do Dente/métodos , Adesivos/química , Colagem Dentária/métodos , Materiais Dentários/química , Adesivos Dentinários/química , Dentina , Propriedades de Superfície , Cimentos Dentários , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Cimentos de Resina/químicaRESUMO
The purpose of this study was to examine the shear fatigue strengths of a resin composite bonded to dentin. Three adhesive systems - a two-step self-etch adhesive (OptiBond XTR; Kerr) and two universal adhesives [Scotchbond Universal (3M ESPE) and G-Premio Bond (GC)] - were used in self-etch mode to bond a resin composite to dentin at a physiologic frequency of 2 Hz over 50,000, 100,000, and 1,000,000 cycles. A staircase method of fatigue testing was used. Twenty specimens were used for each test condition. There was no significant difference in shear fatigue strength across the cycling periods for the three individual adhesives. Differences in shear fatigue strength were found among the three adhesives within each cycling period. Regardless of the adhesive used in self-etch mode for bonding a resin composite to dentin, shear fatigue strength was not influenced by the number of cycles used for testing.
Assuntos
Resinas Compostas/química , Colagem Dentária/métodos , Dentina/química , Cimentos de Resina/química , Análise do Estresse Dentário , Humanos , Técnicas In Vitro , Teste de Materiais , Metacrilatos , Dente Molar , Resistência ao Cisalhamento , Dióxido de Silício , Propriedades de Superfície , ZircônioRESUMO
Post and core fabrication is important in the restoration of endodontically treated teeth. Significant coronal and radicular dentin destruction commonly occurs in endodontically treated teeth. As a result, preserving all the remaining tooth structure is imperative in order to improve the prognosis of the restorative treatment. Core height and width need to be carefully designed and built in order to receive the final restoration. Direct free-hand composite resin core buildup in increments may be a challenging and time-consuming procedure in the dental chair. The case report presented in this article describes a clinical technique using a clear matrix to receive composite resin injections in order to achieve an ideal shape and core size.
Assuntos
Técnica para Retentor Intrarradicular , Fraturas dos Dentes , Dente não Vital , Resinas Compostas , Dentina , HumanosRESUMO
This clinical report describes designing and fabricating a single-retainer resin-bonded fixed dental prosthesis with a chair-side computer-aided design/computer-aided manufacturing system. The whole procedure, from tooth extraction to final placement of the prosthesis, was completed in one day, and a single clinic visit. No clinical complications were found at the 2-year follow-up after placement of the restoration, and satisfactory functional and esthetic results were achieved.